modernize-spelling: bye-and-bye -> by-and-by

se/spelling.py

@@ -464,6 +464,7 @@ def modernize_spelling(xhtml: str) -> str:
 	xhtml = regex.sub(r"([^\p{Letter}])([Dd])amn’([^\p{Letter}])", r"\1\2amn\3", xhtml)	# damn' -> damn
 	xhtml = regex.sub(r"Hallowe’en", r"Halloween", xhtml)				# Hallowe’en -> Halloween
 	xhtml = regex.sub(r"’([Pp])lane\b", r"\1lane", xhtml)				# 'plane -> plane
+	xhtml = regex.sub(r"([Bb])ye?-and-([Bb])ye?\b", r"\1y-and-\2y", xhtml)		# by-and-bye, bye-and-by -> by-and-by (Note, may be capitalized in a song title)
 
 
 	# Normalize some names